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173
Jul 6, 2010
07/10
by
GIERLOFF-EMDEN, H. G.; KRITIKOS, G
texts
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THREE EXAMPLES OF USES OF SATELLITES IN GEOGRAPHY ARE GIVEN. LAND CLEARANCE BY FIRE FOR FARMING IN CERTAIN COUNTRIES IS DESCRIBED. SATELLITE SHOTS PERMIT SUPERVISION OF THIS PROCESS AND DETERMINATION OF WIND DIRECTIONS FROM TRAILS OF SMOKE RECORDED ON PHOTOS, WHICH IS USEFUL IN AREAS WITH LIMITED METEOROLOGICAL SERVICES. THE PHENOMENON OF CLOUD COVERAGE OVER MOST OF CENTRAL EUROPE IS DISCUSSED. LOCAL WEATHER VARIATIONS CAN BE OBSERVED BY SATELLITE, WHERE LAND AND SEA WIND CIRCULATIONS CREATE...
Topics: SOILS, TEMPERATURE MEASUREMENT, ANNUAL VARIATIONS, HEATING, MOISTURE CONTENT, VEGETATION
278
278
Jun 12, 2011
06/11
by
Cabrol, N. A.; Greeley, R., et al
texts
eye 278
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We surveyed the characteristic of non-organized soils at Gusev crater at microscale and macroscale in four main traverse regions: (1) Landing site to Bonneville crater; (2) Bonneville to West Spur; (3) the West Spur region; and (4) the Columbia Hills up to sol 363. Non-organized soils are defined as soils traversed by Spirit that do not include drifts, ripples, or dunes.
Topics: SUNSPOT CYCLE, SUN, ANNUAL VARIATIONS, EARTH SCIENCES, AMPLITUDES, PARAMETERIZATION
140
140
Jul 11, 2010
07/10
by
GRINGAUZ, K. I.; BEZRUKIKH, V. V.; VERIGIN, M. I.; REMIZOV, A. P
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eye 140
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THE PRELIMINARY RESULTS OF SOUNDING MEASUREMENTS OF PLASMA ION AND ELECTRON COMPONENTS ON MARS-5 AND MARS-7 ARE PRESENTED. THE MEASUREMENTS WERE MADE IN MARCH 1974 IN THE ANTISOLAR REGION NEAR MARS.
Topics: ANNUAL VARIATIONS, ATMOSPHERIC PHYSICS, STRATOSPHERE, CLIMATOLOGY, METEOROLOGY, NORTHERN HEMISPHERE
157
157
May 27, 2011
05/11
by
Jewitt, Davi
texts
eye 157
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The aim of this proposal was to analyse a set of charge-coupled device images of the Jupiter-impacting comet D/Shoemaker-Levy 9. The images were obtained primarily using the University of Hawaii 2.2-m telescope and a standardized imaging device, providing an unusually uniform set of data. Additional data included a set of spectra taken in search of gaseous emission from SL9 using the UH 2.2-m and Keck 10-m telescopes.
Topics: ANNUAL VARIATIONS, CARBON, PARTICULATES, SARGASSO SEA, DIFFUSION, ADVECTION, ESTIMATES, OXYGEN,...
277
277
Jul 10, 2010
07/10
by
HONNEF, H
texts
eye 277
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A WINDPOWERED ELECTRICAL GENERATOR IS REPORTED THAT CONSISTS OF TWO COUNTER-ROTATING WHEELS, ONE BEING THE ARMATURE AND THE OTHER BEING THE FIELD. MEANS OF COMPENSATING FOR VARYING WIND SPEED ARE DESCRIBED.
Topics: ARIZONA, METEOROLOGICAL PARAMETERS, OBSERVATORIES, ANNUAL VARIATIONS, GRAPHS (CHARTS), TABLES...
306
306
Jun 1, 2011
06/11
by
Hambourger, Paul D
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To develop and test new materials for use in space power systems and related space and commercial applications, to assist industry in the application of these materials, and to achieve an adequate understanding of the mechanisms by which the materials perform in their intended applications.
Topics: SUMMER, RAIN, TROPICAL REGIONS, AFRICA, TRMM SATELLITE, ANNUAL VARIATIONS, FREQUENCY RANGES
142
142
Jul 6, 2010
07/10
by
Yastrebov, V. S
texts
eye 142
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Engineering methods of analysis and synthesis of electrohydraulic control system for underwater manipulators with position feedbacks are discussed. An approximation of a control system by an aperiodic unit is presented.
Topics: COSMIC RAYS, ISCHEMIA, ANNUAL VARIATIONS, HEART DISEASES, MYOCARDIAL INFARCTION, SOLAR RADIATION
391
391
Jul 11, 2010
07/10
by
NEBEL, R
texts
eye 391
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THE INVOLVEMENT OF RUDOLF NEBEL IN THE HISTORY OF AIRCRAFT AND ROCKET FLIGHTS IS REVIEWED.
Topics: IDAHO, PHOTOMAPPING, SOIL MAPPING, VEGETATION, ANNUAL VARIATIONS, EARTH RESOURCES PROGRAM,...
323
323
Jun 3, 2011
06/11
by
Galea, Stephen C.; Ryall, Thomas G.; Henderson, Douglas A.; Moses, Robert W.; White, Edward V.; Zimcik, David G
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eye 323
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Buffeting is an aeroelastic phenomenon that is common to high performance aircraft, especially those with twin vertical tails like the F/A-18, at high angles of attack. These loads result in significant random stresses, which may cause fatigue damage leading to restricted capabilities and availability of the aircraft. This paper describes an international collaborative research activity among Australia, Canada and the United States involving the use of active structural control to alleviate the...
Topics: ATMOSPHERIC MOISTURE, MARS ATMOSPHERE, MARS SURFACE, POLAR REGIONS, WATER VAPOR, ANNUAL VARIATIONS
364
364
Jun 1, 2010
06/10
by
Mishin, V. M.; Naydenova, N. YA.; Shchukina, T. V
texts
eye 364
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Amplitudes and phases of first harmonics of magnetic storm annual variation dependence on storm intensity and 11 year cycle
Topics: ANNUAL VARIATIONS, HARMONICS, INTENSITY, MAGNETIC STORMS, OCCURRENCES, ANNUAL VARIATION, HARMONICS,...
345
345
Jul 23, 2010
07/10
by
Dorr, Dan W
texts
eye 345
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Work being accomplished to develop a real-time, piloted simulation of a helicopter using the vertical motion simulator at NASA Ames is discussed. The trajectory generation algorithm and the flight path controller are described, and the software integration of the entire terrain following/terrain avoidance (TF/TA) system is discussed. Real-time simulation requirements and the unique features of applying TF/TA system to helicopter flight are summarized. Initial results indicate that the system is...
Topics: ANNUAL VARIATIONS, DUST STORMS, MARS (PLANET), POLAR REGIONS, CAP CLOUDS, SOUTHERN HEMISPHERE,...
179
179
May 31, 2011
05/11
by
Leake, David B
texts
eye 179
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The goal of this project was to apply artificial intelligence techniques to facilitate capture and reuse of aerospace design rationale. The project combined case-based reasoning (CBR) and concept maps (CMaps) to develop methods for capturing, organizing, and interactively accessing records of experiences encapsulating the methods and rationale underlying expert aerospace design, in order to bring the captured knowledge to bear to support future reasoning. The project's results contribute both...
Topics: ANNUAL VARIATIONS, ATMOSPHERIC TEMPERATURE, SEA SURFACE TEMPERATURE, TEMPERATURE DISTRIBUTION,...
1,999
2.0K
May 28, 2011
05/11
by
NON
texts
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This report (Volume 1) is comprised of 5 sessions of the Air Transport Research Group (ATRG) Conference held in Antwerp, Belgium, July 1998. The sessions contain 3-4 papers (presentations) each. The session numbers and their respective headings are: (1) Airline alliances; (2) Airline Competition and Market Structure; (4) Liberalization, Open Skies, and Policy Issues; (5) Yield Management and Other Models; and (11) Air Traffic Control (ATC) and Air Navigational Systems (ANS).
Topics: ANNUAL VARIATIONS, BIOMASS, ESTIMATING, SATELLITE OBSERVATION, CARBON, ENERGY BUDGETS, FARM CROPS,...
199
199
May 31, 2011
05/11
by
George, I. M.; Mushotzky, R. F; Turner, T. J.; Netzer, H.; Kraemer, S. B.; Ruiz, J.; Chelouche, D.; Crenshaw, D. M.; Yaqoob, T.; Nandra, K.
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We present the first high-resolution, X-ray image of the circumnuclear regions of the Seyfert 1 galaxy NGC 3516, using the Chandra X-ray Observatory (CXO). All three of the CXO observations reported were performed with one of the two grating assemblies in place, and here we restrict our analysis to undispersed photons (i.e. those detected in the zeroth-order). A previously-unknown X-ray source is detected approximately 6 arcsec (1.1h(sub 75)(exp -1) kpc) NNE of the nucleus (position angle...
Topics: ANNUAL VARIATIONS, SEA ICE, VARIABILITY, ICE REPORTING, SATELLITE OBSERVATION, ALGORITHMS, ARCTIC...
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629
May 31, 2011
05/11
by
Nelson, Michael L.; Argue, Brad; Efron, Miles; Denn, Sheila; Pattuelli, Maria Cristin
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eye 629
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Many early web-based digital libraries (DLs) had implicit assumptions reflected in their architecture that the unit of focus in the DL (frequently ''reports'' or ''e-prints'') would only be manifested in a single, or at most a few, common file formats such as PDF or PostScript. DLs have now matured to the point where their contents are commonly no longer simple files. Complex objects in DLs have emerged from in response to various requirements, including: simple aggregation of formats and...
Topics: MARS ATMOSPHERE, THERMAL EMISSION, WATER VAPOR, ANNUAL VARIATIONS, MARS GLOBAL SURVEYOR, POLAR...
166
166
Jun 11, 2011
06/11
by
Jeong, Seong-Il; Didion, Jeffre
texts
eye 166
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The electric field applied in dielectric fluids causes an imbalance in the dissociation-recombination reaction generated free space charges. The generated charges are redistributed by the applied electric field resulting in the heterocharge layers in the Vicinity of the electrodes. Proper design of the electrodes generates net axial flow motion pumping the fluid. The electrohydrodynamic (EHD) conduction pump is a new device that pumps dielectric fluids utilizing heterocharge layers formed by...
Topics: GLACIERS, COLLAPSE, ANNUAL VARIATIONS, ANTARCTIC REGIONS, ICE, CLOUD AND LAND ELEVATION SATELLITE,...
231
231
Jun 1, 2011
06/11
by
Gaier, James R.; Vandenburg, Yvonne Yoder; Berkebile, Steven; Stueben, Heather; Balagadde, Frederic
texts
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A series of woven fabric laminar composite plates and narrow strips were fabricated from a variety of pitch-based pristine and bromine intercalated graphite fibers in an attempt to determine the influence of the weave on the electrical and thermal conduction. It was found generally that these materials can be treated as if they are homogeneous plates. The rule of mixtures describes the resistivity of the composite fairly well if it is realized that only the component of the fibers normal to the...
Topics: GLOBAL POSITIONING SYSTEM, RADIO OCCULTATION, EARTH LIMB, REFRACTIVITY, TROPOSPHERE,...
329
329
Jul 11, 2010
07/10
by
Shatalov, A. Y.; Kravchenko, T. A.; Aleksandrova, Z. F
texts
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A thermodynamic calculation is made of the degree of equilibrium oxidation reduction conversion of quinone-hydroquinone and metal containing redoxites; its experimental verification with respect to the redox potential was carried out. The effect of various factors on the completeness of the utilization of the theoretical potential is noted.
Topics: MARS ATMOSPHERE, MOISTURE CONTENT, WATER VAPOR, ANNUAL VARIATIONS, ASTRONOMICAL SPECTROSCOPY, MARS...
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147
May 23, 2011
05/11
by
Frazier, D. O.; Hung, R. J.; Paley, M. S.; Long, Y. T
texts
eye 147
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In this work, we describe a preliminary investigation of buoyancy-driven heat transfer during the growth of thin films from solution following exposure to ultraviolet (UV) light. Irradiation of the growth cell occurs at various directions relative to gravitational acceleration. Through numerical computations, the steady-state flow and temperature profiles are simulated during the course of light exposure. Light-induced polymerization accompanies a heat transfer process through a fairly...
Topics: CLIMATOLOGY, ANNUAL VARIATIONS, VORTICES, STRATOSPHERE, ATMOSPHERIC COMPOSITION, LAMINATES,...
259
259
Jun 9, 2011
06/11
by
Finzi, Alberto; Ingrand, Felix; Muscettola, Nicol
texts
eye 259
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This paper reports on the design and implementation of a real-time executive for a mobile rover that uses a model-based, declarative approach. The control system is based on the Intelligent Distributed Execution Architecture (IDEA), an approach to planning and execution that provides a unified representational and computational framework for an autonomous agent. The basic hypothesis of IDEA is that a large control system can be structured as a collection of interacting agents, each with the...
Topics: CARBON MONOXIDE, METHANE, BIOMASS BURNING, ANNUAL VARIATIONS, AIR MASSES, PHOTOCHEMICAL REACTIONS,...
285
285
Jul 12, 2010
07/10
by
Armstrong, E. S.; Tripp, J. S
texts
eye 285
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The digital versions of optimal linear regulator theory and eigenvalue placement theory are applied to the Mach number control loop of the National Transonic Facility cryogenic wind tunnel. The control laws developed are evaluated on a nonlinear simulation of the tunnel process for a typical est condition and are found to significantly reduce the open loop time required to achieve a Mach number set point.
Topics: FREQUENCY STANDARDS, INDIA, TIME SIGNALS, VERY LOW FREQUENCIES, ANNUAL VARIATIONS, DIURNAL...
210
210
Jun 3, 2011
06/11
by
Buck, Bill K.; Velotas, Steven G
texts
eye 210
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In support of NASA Virtual Airspace Modeling and Simulation (VAMS) project, an effort was initiated to develop and test techniques for extracting meteorological data from landing and departing aircraft, and for building altitude based profiles for key meteorological parameters from these data. The generated atmospheric profiles will be used as inputs to NASA s Aircraft Vortex Spacing System (AVOLSS) Prediction Algorithm (APA) for benefits and trade analysis. A Wake Vortex Advisory System...
Topics: MATHEMATICAL MODELS, GRAVITY WAVES, PLANETARY WAVES, WIND VELOCITY, ANNUAL VARIATIONS, SPECTRAL...
276
276
May 31, 2011
05/11
by
Kearns, Kimberly A
texts
eye 276
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The revamping of an Ignition Test Facility, located in the Research Combustion Laboratory at the NASA Glenn Research Center, is presented. The history of how the test cell has adapted efficiently to a variety of test programs is discussed. The addition of a second test stand for ignition and small-scale rocket testing is detailed. An overview of the facility and the current test programs is offered. Planned upgrades for the future are outlined.
Topics: HABITATS, ANNUAL VARIATIONS, WILDLIFE, BIRDS, MERRITT ISLAND (FL), MARSHLANDS, SHORELINES,...
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218
Jul 11, 2010
07/10
by
NON
texts
eye 218
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Flight tests conducted in December 1973 demonstrated the ability of an unisexual urine collection subsystem to function in a zero-g environment. The urinal, which could be adjusted with three degrees of freedom, accommodated 16 female test subjects with a wide range of stature, as well as five male test subjects. The urinal was in intimate contact with the female and was contoured to form an effective air seal at the periphery. When positioned 2-4 inches forward, the urinal could be used for...
Topics: ANNUAL VARIATIONS, SOLAR ENERGY, THERMOCLINES, ENERGY ABSORPTION, LUMINOUS INTENSITY, TEMPERATURE...
353
353
Jul 21, 2010
07/10
by
NON
texts
eye 353
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Phase one and two of a program to further develop and investigate advanced graphite epoxy waveguides, radiators, and components with application to space antennas are discussed. The objective of the two phases were to demonstrate mechanical integrity of a small panel of radiators and parts procured under a previous contract and to develop alternate designs and applications of the technology. Most of the emphasis was on the assembly and test of a 5 x 5 element module. This effort was supported...
Topics: ATMOSPHERIC CIRCULATION, ATMOSPHERIC MODELS, OZONE, RADIANT FLUX DENSITY, WATER VAPOR, ANNUAL...
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201
Jul 6, 2010
07/10
by
VASILYEV, V.; LEONIDOV, L. N
texts
eye 201
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THE DEVELOPMENT AND UTILIZATION OF SPACE TRANSPORT VEHICLES ARE DISCUSSED. THE SPECIFIC PROBLEMS IN STRUCTURE AND CONFIGURATION OF SPACE TRANSPORT VEHICLES ARE EXAMINED. THE TYPES OF PROPULSION SYSTEMS AND EXPECTED PERFORMANCE ARE DESCRIBED. THE PROPOSED MISSIONS ARE OUTLINED AND THE COST EFFECTIVENESS WITH RESPECT TO CURRENT SPACECRAFT OPERATIONS IS ANALYZED.
Topics: SOIL SCIENCE, STATISTICAL ANALYSIS, TEMPERATURE PROFILES, ANNUAL VARIATIONS, ATMOSPHERIC MOISTURE,...
238
238
Jun 2, 2011
06/11
by
Tkachuk, Oksana; Dwyer, Matthew B.; Pasareanu, Corina S
texts
eye 238
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A key problem in model checking open systems is environment modeling (i.e., representing the behavior of the execution context of the system under analysis). Software systems are fundamentally open since their behavior is dependent on patterns of invocation of system components and values defined outside the system but referenced within the system. Whether reasoning about the behavior of whole programs or about program components, an abstract model of the environment can be essential in...
Topics: THREE DIMENSIONAL MODELS, VARIABILITY, ANNUAL VARIATIONS, TRANSPORT THEORY, TROPICAL REGIONS, DATA...
166
166
Jul 11, 2010
07/10
by
RIPOLL, C.; DEMARTY, M.; SELEGNY, E
texts
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A THEORETICAL INTERPRETATION OF ELECTROOSMOTIC MEASUREMENTS OF A CATION-EXCHANGE MEMBRANE UNDER NATURAL OR IMPOSED CONVECTION IS DISCUSSED. THE CALCULATIONS ARE BASED ON THE STEADY-STATE FLOW PROPERTIES DESCRIBED BY NERNST-PLANCK EQUATIONS. THE MEMBRANE IS ASSUMED TO BE HOMOGENEOUS, AND THE THICKNESS OF THE POLARIZATION LAYERS, DESCRIBED IN NERNST'S HYPOTHESIS, IS SUPPOSED TO BE IDENTICAL. IT WAS POSSIBLE TO EXPRESS THE PARAMETERS WHICH INFLUENCE THE ELECTROOSMOTIC FLOW, ESPECIALLY THE...
Topics: NORTHERN HEMISPHERE, PRESSURE DISTRIBUTION, STRATOSPHERE, TROPICAL REGIONS, WIND PROFILES, ANNUAL...
The relationships of ozone near the tropopause with potential vorticity temperature, and distance from the tropopause are examined. Data are also used to estimate the vertical and horizontal fluxes of ozone near the tropopause. The present estimates of the total flux of ozone into the troposphere verify the model results. Although the distribution of flux between mean motions and diffusion is different and thus suggests that models with coarse horizontal resolution must continue to parameterize...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC DIFFUSION, OZONE, TROPOPAUSE, ANNUAL VARIATIONS,...
527
527
Jun 2, 2011
06/11
by
Hanson, John M.; Hall, Charles E.; Mulqueen, John A.; Jones, Robert E
texts
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Advanced guidance and control (AG&C) technologies are critical for meeting safety, reliability, and cost requirements for the next generation of reusable launch vehicle (RLV), whether it is fully rocket-powered or has air- breathing components. This becomes clear upon examining the number of expendable launch vehicle failures in the recent past where AG&C technologies could have saved a RLV with the same failure mode, the additional vehicle problems where t h i s technology applies, and...
Topics: EARTH SCIENCES, REMOTE SENSING, SPACE COMMERCIALIZATION, MISSION TO PLANET EARTH, CLIMATE CHANGE,...
184
184
Jul 11, 2010
07/10
by
Basson, D
texts
eye 184
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No Abstract Available
Topics: GEOMAGNETIC TAIL, MAGNETIC FIELD CONFIGURATIONS, MAGNETIC MEASUREMENT, ANNUAL VARIATIONS, EXPLORER...
The heat pipes job is to keep the arctic ground frozen. The permafrost soil alternately freezes and thaws with seasonal temperature changes causing surface dislocations and problems for the builders. In winter, a phenomenon called frost-heaving uplifts the soil. It is something like the creation of highway potholes by the freezing of rainwater below the roadbed, but frost-heaving exerts a far greater force. Thawing of the frost in the summer causes the soil to settle unevenly. Therefore it is...
Topics: NASA Technical Reports Server (NTRS), HEAT PIPES, PIPELINES, SOILS, SUPPORTS, PERMAFROST, FREEZING,...
509
509
Jul 12, 2010
07/10
by
NON
texts
eye 509
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Photographs of the planet Mars generated by the Viking Mars program are presented and discussed. The Martian surface and its volcanoes receive particular attention. In addition, the atmosphere, temperature, surface craters, polar regions, and composition of Mars are briefly reviewed. Planetary evolution is considered. The highlights of the Mariner program for Mars are given.
Topics: AMBIENCE, STATISTICAL ANALYSIS, ANNUAL VARIATIONS, GLOBAL AIR SAMPLING PROGRAM, IONOSONDES, OZONE,...
558
558
Jun 3, 2011
06/11
by
Florance, Jennifer P.; Burner, Alpheus W.; Fleming, Gary A.; Martin, Christopher A
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An overview of the contributions of the NASA Langley Research Center (LaRC) to the DARPA/AFRL/NASA/ Northrop Grumman Corporation (NGC) Smart Wing program is presented. The overall objective of the Smart Wing program was to develop smart technologies and demonstrate near-flight-scale actuation systems to improve the aerodynamic performance of military aircraft. NASA LaRC s roles were to provide technical guidance, wind-tunnel testing time and support, and Computational Fluid Dynamics (CFD)...
Topics: ANNUAL VARIATIONS, GRAVITATIONAL FIELDS, POLAR REGIONS, MARS (PLANET), CARBON DIOXIDE, DETECTION,...
435
435
Jun 11, 2011
06/11
by
Jeram, Geoffrey J
texts
eye 435
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This Open Platform for Limit Protection guides the open design of maneuver limit protection systems in general, and manned, rotorcraft, aerospace applications in particular. The platform uses three stages of limit protection modules: limit cue creation, limit cue arbitration, and control system interface. A common set of limit cue modules provides commands that can include constraints, alerts, transfer functions, and friction. An arbitration module selects the ''best'' limit protection cues and...
Topics: BIOMASS BURNING, ARID LANDS, GRASSLANDS, AFRICA, SATELLITE IMAGERY, ANNUAL VARIATIONS, NIGHT,...
184
184
May 23, 2011
05/11
by
Stebbins, R. T.; Bender, P. L.; Folkner, W. M
texts
eye 184
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Gravitational wave signals from a large number of astrophysical sources will be present in the LISA data. Information about as many sources as possible must be estimated from time series of strain measurements. Several types of signals are expected to be present: simple periodic signals from relatively stable binary systems, chirped signals from coalescing binary systems, complex waveforms from highly relativistic binary systems, stochastic backgrounds from galactic and extragalactic binary...
Topics: TROPOPAUSE, MIXING RATIOS, MASS TRANSFER, ANNUAL VARIATIONS, STRATOSPHERE, ATMOSPHERIC CIRCULATION,...
We review here the progress of the Variability of the American MOnsoon Systems (VAMOS) extremes working group since it was formed in February of 2010. The goals of the working group are to 1) develop an atlas of warm-season extremes over the Americas, 2) evaluate existing and planned simulations, and 3) suggest new model runs to address mechanisms and predictability of extremes. Substantial progress has been made in the development of an extremes atlas based on gridded observations and several...
Topics: NASA Technical Reports Server (NTRS), MONSOONS, WESTERN HEMISPHERE, WEATHER FORECASTING, ANNUAL...
The causes of geomagnetic activity are studied both theoretically in terms of the reconnection model and empirically using the am-index and interplanetary solar wind parameters. It is found that two separate mechanisms supply energy to the magnetosphere. One mechanism depends critically on the magnitude and direction of the interplanetary magnetic field. Both depend strongly on solar wind speed. The energy input is modulated by the tilt of the dipole axis being maximum for 90 deg tilt against...
Topics: NASA Technical Reports Server (NTRS), EARTH MAGNETOSPHERE, GEOMAGNETISM, ANNUAL VARIATIONS,...
320
320
Jun 3, 2011
06/11
by
Montgomery, Raymond C.; Granda, Jose J
texts
eye 320
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Conceptually, modeling of flexible, multi-body systems involves a formulation as a set of time-dependent partial differential equations. However, for practical, engineering purposes, this modeling is usually done using the method of Finite Elements, which approximates the set of partial differential equations, thus generalizing the approach to all continuous media. This research investigates the links between the Bond Graph method and the classical methods used to develop system models and...
Topics: POLAR REGIONS, THERMAL EMISSION, MARS SURFACE, ICE, DEPOSITS, ANNUAL VARIATIONS, CLIMATE CHANGE,...
183
183
Jun 2, 2011
06/11
by
Singh, Bhi
texts
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The short term purpose of this research is to present a research plan and a roadmap developed for strategic research for the Office of Biological and Physical Research and the long term purpose is to conduct necessary ground-based and space-flight low gravity experiments, complemented by analyses, resulting in a documented framework for parameter prediction of needed by designers. This paper is presented in viewgraph form.
Topics: MATHEMATICAL MODELS, ANNUAL VARIATIONS, MESOSPHERE, PLANETARY WAVES, WIND (METEOROLOGY), HEAT...
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236
May 31, 2011
05/11
by
Patel, Umesh D.; DellaTorre, Edwar
texts
eye 236
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A fast differential equation approach for the DOK model has been extented to the CMH model. Also, a cobweb technique for calculating the CMH model is also presented. The two techniques are contrasted from the point of view of flexibility and computation time.
Topics: ANNUAL VARIATIONS, SURFACE TEMPERATURE, VARIATIONS, ATMOSPHERIC TEMPERATURE, MATHEMATICAL MODELS,...
Long-term variation of U.S. tornadoes were studied by obtaining the best possible data during the 75 years, 1916-90. The most difficult task was to estimate the number of early tornadoes in 1916-50 when the reporting efficiency was very bad, resulting in undercounting of the incidents. In generating the best possible data, Fujita's Tornado Tape produced at the University of Chicago, the book Significant Tornadoes, 1880-1989, by Thomas P. Grazulis, and the NSSFC Tornado Tape were combined....
Topics: NASA Technical Reports Server (NTRS), CLIMATOLOGY, NUMERICAL ANALYSIS, RATIONS, TORNADOES, ANNUAL...
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208
May 29, 2011
05/11
by
Naftel, J. Chri
texts
eye 208
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In response to the Access to Space Study, which was conducted in 1993 through the Office of Space Systems Development, an advanced technology Reusable Launch Vehicle (RLV) was selected for demonstration. The X-33 was advanced as an demonstration project, to build and test a 53-percent scale prototype of an operational RLV, it would also demonstrate new technologies which would be required to assure the operation of the new RLV. This presentation reviews the progress of the X-33 development and...
Topics: INFORMATION SYSTEMS, CLOUDS (METEOROLOGY), STATISTICAL ANALYSIS, METEOROLOGICAL RADAR, REFLECTANCE,...
Variations in the scalar magnetic field (delta B) from the polar orbiting OGO 2, 4, and 6 spacecraft are examined as a function of altitude for times when the interplanetary magnetic field is toward the sun and for times when the interplanetary magnetic field away from the sun. This morphology is basically the same as that found when all data, irrespective of interplanetary magnetic sector, are averaged together. Differences in delta B occur, both between sectors and between seasons, which are...
Topics: NASA Technical Reports Server (NTRS), EARTH MAGNETOSPHERE, INTERPLANETARY MAGNETIC FIELDS, OGO,...
Stationary planetary waves in the southern stratosphere display a characteristic seasonal cycle. Previous research based on a one-dimensional model suggests that this behavior is mainly determined by seasonally varying transmission properties of the atmosphere with respect to wave propagation. The issue is investigated with the help of a hemispheric, linear, quasigeostrophic model. It reproduces well some of the observed qualitative features and is internally consistent in the sense that its...
Topics: NASA Technical Reports Server (NTRS), PLANETARY WAVES, STRATOSPHERE, WAVE PROPAGATION, ANNUAL...
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566
Jul 26, 2010
07/10
by
Drummond, Charles H., III; Bansal, Narottam P
texts
eye 566
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Glass of stoichiometric celsian composition, BaO-Al2O3-2SiO2, is a potential glass-ceramic matrix for high-temperature composites. The glass has a density of 3.39 g/cu cm, thermal expansion coefficient of 6.6 x 10(exp -6)/deg C glass transition temperature of 910 C, and dilatometric softening point of 925 C. On heat treatment, only hexacelsian crystallized out on the surface, but both celsian and hexacelsian were present in the bulk. Effects of cold isostatic pressing (CIP), sintering, and hot...
Topics: EUROPE, GRAPHS (CHARTS), MAPS, GEOPOTENTIAL HEIGHT, MOISTURE CONTENT, PRESSURE MEASUREMENT,...
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475
May 29, 2011
05/11
by
Schmidt, Ernst; Wenner, Kar
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A method for recording the local heat-transfer coefficients on bodies in flow was developed. The cylinder surface was kept at constant temperature by the condensation of vapor except for a narrow strip which is heated separately to the same temperature by electricity. The heat-transfer coefficient at each point was determined from the electric heat output and the temperature increase. The distribution of the heat transfer along the circumference of cylinders was recorded over a range of...
Topics: ANTARCTIC REGIONS, COASTS, LAND ICE, CHANGE DETECTION, ANNUAL VARIATIONS, ADVANCED VERY HIGH...
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May 23, 2011
05/11
by
Pellis, Neal R.; Duray, Paul H.; Hatfill, Steven J
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Attempts to simulate normal tissue micro-environments in vitro have been thwarted by the complexity and plasticity of the extracellular matrix, which is important in regulating cytoskeletal and nuclear matrix proteins. Gravity is one of the problems, tending to separate components that should be kept together. For space shuttle experiments, NASA engineers devised a double-walled rotating bioreactor, which is proving to be a useful tissue culture device on earth as well as in space.
Topics: NOCTURNAL VARIATIONS, HARMONIC ANALYSIS, OSCILLATIONS, MESOSPHERE, HYDROXYL EMISSION, FOURIER...
Variations in the total (i.e. scalar) magnetic field data from the polar orbiting OGO-2, 4, and 6 spacecraft (altitudes 400-1510 km) are summarized for invariant latitudes above 55 deg. Data from all degrees of magnetic disturbance are included. The data are presented in terms of the quantity delta B(= measured field magnitude minus the field magnitude from a spherical harmonic model of the quiet field).
Topics: NASA Technical Reports Server (NTRS), MAGNETIC DISTURBANCES, MAGNETIC FIELDS, OGO, POLAR REGIONS,...
Topics: NASA Technical Reports Server (NTRS), ANTARCTIC REGIONS, ATMOSPHERIC COMPOSITION, OZONE, OZONE...
